For folks lucky enough to have Acrobat 4.0 or the Acrobat Distiller, conversion of a NWC file to PDF format is as simple as selecting the Acrobat Distiller as the printer. Otherwise Fred Nachbaur's method works great (and is much cheaper than buying Acrobat 4.0).
P.S. Acrobat also allows file open/play links to be inserted into pdf files so that folks can click and hear as well as see the score on the Web.